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| Main Authors: | , , |
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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2007
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| Online Access: | https://doi.org/10.1594/PANGAEA.721799 |
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| _version_ | 1867168079363964928 |
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| author | Came, Rosemarie E Oppo, Delia W McManus, Jerry F |
| author_facet | Came, Rosemarie E Oppo, Delia W McManus, Jerry F |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Paired planktic foraminiferal d18O and Mg/Ca data reveal trends of increasing temperatures (~3 °C) and salinities in the subpolar North Atlantic over the course of the Holocene, which were punctuated by abrupt events. The trends likely reflect an insolation-forced northward retreat of the boundary between polar and North Atlantic subsurface waters. The superimposed variability does not appear to be periodic, but tends to recur within a broad millennial band. The records provide convincing evidence of open-ocean cooling (nearly 2°C) and freshening during the 8.2 ka event, and suggest similar conditions at 9.3 ka. However, the two largest temperature oscillations in our record (~2°C) occurred during the past 4 k.y., suggesting a recent increase in temperature variability relative to the mid-Holocene, perhaps in response to neoglaciation, which began at about this time. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_721799 |
| institution | PANGAEA |
| language | en |
| publishDate | 2007 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table DR1) Accelerator mass spectrometry radiocarbon dates and calendar ages of sediments from ODP Hole 162-984C Came, Rosemarie E Oppo, Delia W McManus, Jerry F 162-984C; Accelerator mass spectrometry (AMS); Age, dated; Age, dated, standard deviation; Calculated; Calendar age; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg162; North Atlantic Ocean; Ocean Drilling Program; ODP; Sample, optional label/labor no; Sample code/label; Sigma; Species Paired planktic foraminiferal d18O and Mg/Ca data reveal trends of increasing temperatures (~3 °C) and salinities in the subpolar North Atlantic over the course of the Holocene, which were punctuated by abrupt events. The trends likely reflect an insolation-forced northward retreat of the boundary between polar and North Atlantic subsurface waters. The superimposed variability does not appear to be periodic, but tends to recur within a broad millennial band. The records provide convincing evidence of open-ocean cooling (nearly 2°C) and freshening during the 8.2 ka event, and suggest similar conditions at 9.3 ka. However, the two largest temperature oscillations in our record (~2°C) occurred during the past 4 k.y., suggesting a recent increase in temperature variability relative to the mid-Holocene, perhaps in response to neoglaciation, which began at about this time. |
| title | (Table DR1) Accelerator mass spectrometry radiocarbon dates and calendar ages of sediments from ODP Hole 162-984C |
| topic | 162-984C; Accelerator mass spectrometry (AMS); Age, dated; Age, dated, standard deviation; Calculated; Calendar age; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Joides Resolution; Leg162; North Atlantic Ocean; Ocean Drilling Program; ODP; Sample, optional label/labor no; Sample code/label; Sigma; Species |
| url | https://doi.org/10.1594/PANGAEA.721799 |